The shape of the J = 0→1 rotational line of HC¹⁵N at 86 GHz has been recorded in collision with various polar and diatomic molecules and with all rare gases within the 135-300 kelvin temperature range. The coherent transient technique employed, optical precession in the time domain, has revealed as very propitious to analyze departures observed from the Voigt profile. First, a detailed analysis of frequency-instabilities of the electromagnetic source has been done and their consequences on observed signals are discussed in details. Then, it has been clearly evidenced that Voigt profile departures result from the speed-dependence (SD) of collisional broadening and frequency-shifting rates, a feature responsible of narrowing and asymmetry of lineshapes, respectively, in the frequency domain. In contrast, it appears that velocity/speed changing collisions have a negligible influence. From a comparison of the hypergeometric SD-Voigt profile with the quadratic SD-Voigt profile, it is shown the latter could be inappropriate in case of SD-frequency-shifts. So, experimental records have been fitted using the asymmetric hypergeometric SD-Voigt profile and temperature dependences have been analyzed. Finally and as required for inclusion in databases, results are also given using Hartmann-Tran profile parameters.

 HC ¹⁵的J = 0→1旋转线的形状已记录到 86 GHz 下的 N 与各种极性和双原子分子以及 135-300 开尔文温度范围内的所有稀有气体发生碰撞。所采用的相干瞬态技术，即时域中的光学进动，表明非常有利于分析从 Voigt 剖面观察到的偏离。首先，对电磁源的频率不稳定性进行了详细分析，并详细讨论了它们对观测信号的影响。然后，已经清楚地证明 Voigt 轮廓偏离是由碰撞展宽和频移率的速度相关性 (SD) 引起的，这是频域中分别导致线形变窄和不对称的特征。相比之下，速度/速度变化碰撞的影响似乎可以忽略不计。从超几何 SD-Voigt 轮廓与二次 SD-Voigt 轮廓的比较中可以看出，后者在 SD 频移的情况下可能是不合适的。因此，使用非对称超几何 SD-Voigt 剖面拟合了实验记录，并分析了温度依赖性。最后，根据包含在数据库中的要求，还使用 ​​Hartmann-Tran 配置文件参数给出了结果。